Merge branch 'master' into feat/dp/default-button-center-align

ExpressApp · Jun 22, 2023 · 1c7fc5b · 1c7fc5b
2 parents b2caf68 + 06af540
commit 1c7fc5b
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diff --git a/poetry.lock b/poetry.lock
diff --git a/pybotx/missing.py b/pybotx/missing.py
@@ -1,9 +1,16 @@
-from typing import Literal, TypeVar, Union
+from typing import Any, List, Literal, TypeVar, Union
 
 
 class _UndefinedType:
     """For fields that can be skipped."""
 
+    _instances: List["_UndefinedType"] = []
+
+    def __new__(cls, *args: Any) -> "_UndefinedType":
+        if not cls._instances:
+            cls._instances.append(super().__new__(cls, *args))
+        return cls._instances[-1]
+
     def __bool__(self) -> Literal[False]:
         return False